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BobbyGee Whenever you use a friends urine, there are risks and you really need to know that friend well. I have a story about a man who worked at a steel mill (this was back when drug testing began) and knew the whole plant was going to get tested and he at that time was a regular pot smoker (at home) He panicked about it staying in the system 30 days so he borrowed urine from his sweet and innocent 15 or16yr old daughter, took the test and then found it turned up positive for cocaine

Not a happy father to say the least and had to go to drug counceling but didnt lose his job at least.
If someone is not a regular smoker and say takes 3 hits then 5 days later gets tested, would it show up. I have a friend currently waiting for results and I have reassured him that its highly doubtful it will show up from research I have done. He is lean, drinks plently of fluids and his job makes him work up a sweat nonstop. I have one website that stated it would take 1-2 grams of usage in a weeks period, there is more info but I think my friend will be fine. He was just in a situation and regretted it then and didnt even like it.